The taxonomy of this and related species is complicated, and different authors have drawn very different conclusions (e.g., Sivarajan & Biju, Taxon 39: 665-674. 1990; Dutta & Deb, Taxon. Rev. Hedyotis. 2004). In particular, Hedyotis brachypoda, Hedyotis corymbosa, and Hedyotis erecta are related and have been variously circumscribed[
Hedyotis brachypoda R.Br. ex Wall.
Hedyotis diffusa Willd.
Hedyotis extensa R.Br. ex Wall.
Hedyotis polygonoides Wall.
Hedyotis radicans Bartl. ex DC.
Hedyotis ramosissima Kurz
Oldenlandia angustifolia pedicellata Miq.
Oldenlandia brachypoda G.Don
Oldenlandia corymbosa uniflora (Benth.) Masam.
Oldenlandia herbacea uniflora Benth.
Oldenlandia pauciflora Roxb. ex Wight & Arn.
Oldenlandia diffusa is a slender, annual plant with ascending to procumbent, more or less branched stems up to 50cm long[
The plant is harvested from the wild for local medicinal use.
E. Asia - China, Japan, India, Sri Lanka, Nepal, Bhutan, Bangladesh, Thailand, Malaysia, Indonesia, Philippines.
Paddy fields, ridges of farmlands, humid open fields; at elevations from sea level to 900 metres[
]. A common weed in towns, gardens, and open lands throughout the Philippines[
The plant is alterative, analgesic, antibacterial, antidote, antiinflammatory, antitumor, diuretic, febrifuge and sedative[
]. A decoction of the plant is used in the treatment of biliousness, impure blood, jaundice, hepatitis, fever, malignant tumours and gonorrhoua[
]. It is used to treat any kind of internal inlammation such as inflammation such as tonsillitis, laryngitis, and appendicitis[
A poultice of plant material is applied to external bruises or blood congestions, boils, and abscesses[
]. Topical uses for this species are common and could be related to the presence of antiinflammatory iridoids[
The plant contains four anthraquinones, terpenoids, flavonoids, steroid alchols, alkanes, organic acids, polysaccharides, coumarin and alkaloids[
A study suggested that the plant may be effective in preventing hematopoietic damage when used in combination with radiotherapy360].
A study yielded five flavonol glycosides and four O-acylated iridoid glycosides. All nine compounds exhibited neuroprotective activity[
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